THE KCAL VERA 22 GHz CALIBRATOR SURVEY
THE KCAL VERA 22 GHz CALIBRATOR SURVEY
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DOI：
10.1088/0004-6256/143/2/35
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
L. Petrov;M. Honma;S. Shibata
中科院分区：
文献类型：
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作者：
L. Petrov;M. Honma;S. Shibata
利用22 GHz甚长基线干涉测量（VLBI）射电天体测量阵列VLBI探测，观测了1536个8 GHz相关通量密度大于200 mJy的源。已探测到一半的目标源。检测限约为200 mJy。我们推导出的相关通量密度的877个检测源在三个范围内的投影基线长度。这些观测的目的是确定给定源作为高频双波束和相位参考观测的相位校准器的适用性。初步结果表明，在22 GHz的致密河外源的数量比在8 GHz的相关通量密度水平的亮度是两倍。
We observed a sample of 1536 sources with correlated flux densities brighter than 200 mJy at 8 GHz with the very long baseline interferometry (VLBI) array VLBI Exploration of Radio Astrometry at 22 GHz. One half of the target sources has been detected. The detection limit was around 200 mJy. We derived the correlated flux densities of 877 detected sources in three ranges of projected baseline lengths. The objective of these observations was to determine the suitability of given sources as phase calibrators for dual-beam and phase-referencing observations at high frequencies. Preliminary results indicate that the number of compact extragalactic sources at 22 GHz brighter than a given correlated flux density level is two times less than that at 8 GHz.